TY - GEN
T1 - Synthesis of mixed conducting oxides by an organic steric entrapment method
AU - Kriven, W. M.
AU - Rosczyk, B. R.
AU - Bertoni, M. I.
AU - Mason, Thomas O.
PY - 2003
Y1 - 2003
N2 - Three compounds currently of interest as solid oxide fuel cell components (SOFC's) have been synthesized by the organic steric entrapment method. They were doped lanthanum gallate (La0.8Sr0.2Ga0.83Mg0.17O 0.2815) or "LSGM", samarium doped, cerium oxide (Ce0.8Sm0.2O2-δ) and strontium iron cobaltite (SrFeCo0.5O3-δ). While XRD results indicated that the Ce0.8Sm0.2O2-δ, SrFeCo0.5Ox and LSGM specimens were single phase, SEM observations showed the presence of a grain boundary phase homogeneously surrounding grains in the LSGM specimen. Pellets of LSGM were measured by AC impedance spectroscopy, yielding reliable data in the temperature range from 340°C to 830°C. Some degree of microcracking was also observed in the LSGM microstructure which is most likely responsible for the reduced conductivities vis-à-vis the best literature values. The LSGM here fabricated was fine grained (∼4 μm in diameter) as compared to the ∼15μm of previous literature such that grain boundaries will play a more dominant role. Elongated grains were clearly present in the SrFeCo0.5Ox microstructure.
AB - Three compounds currently of interest as solid oxide fuel cell components (SOFC's) have been synthesized by the organic steric entrapment method. They were doped lanthanum gallate (La0.8Sr0.2Ga0.83Mg0.17O 0.2815) or "LSGM", samarium doped, cerium oxide (Ce0.8Sm0.2O2-δ) and strontium iron cobaltite (SrFeCo0.5O3-δ). While XRD results indicated that the Ce0.8Sm0.2O2-δ, SrFeCo0.5Ox and LSGM specimens were single phase, SEM observations showed the presence of a grain boundary phase homogeneously surrounding grains in the LSGM specimen. Pellets of LSGM were measured by AC impedance spectroscopy, yielding reliable data in the temperature range from 340°C to 830°C. Some degree of microcracking was also observed in the LSGM microstructure which is most likely responsible for the reduced conductivities vis-à-vis the best literature values. The LSGM here fabricated was fine grained (∼4 μm in diameter) as compared to the ∼15μm of previous literature such that grain boundaries will play a more dominant role. Elongated grains were clearly present in the SrFeCo0.5Ox microstructure.
UR - http://www.scopus.com/inward/record.url?scp=0344034818&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0344034818&partnerID=8YFLogxK
U2 - 10.1002/9780470294802.ch43
DO - 10.1002/9780470294802.ch43
M3 - Conference contribution
AN - SCOPUS:0344034818
SN - 9781119040439
T3 - Ceramic Engineering and Science Proceedings
SP - 287
EP - 292
BT - Ceramic Engineering and Science Proceedings
PB - American Ceramic Society
T2 - Ceramic Engineering And Science Proceedings: 27th International Cocoa Beach Conference on Advanced Ceramics and Composites:A
Y2 - 26 January 2003 through 31 January 2003
ER -